package cn.bs.ktv.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;
import java.util.Objects;

import cn.bs.ktv.R;
import cn.bs.ktv.model.SingerModel;

public class SingerListAdapter extends BaseAdapter {
    private final String logName = SingerListAdapter.class.getName();
    private final Context context;
    private final List<SingerModel> list;

    public SingerListAdapter(Context context, List<SingerModel> list) {
        this.context = context;
        this.list = list;
    }

    /**
     * How many items are in the data set represented by this Adapter.
     *
     * @return Count of items.
     */
    @Override
    public int getCount() {
        return list.size();
    }

    /**
     * Get the data item associated with the specified position in the data set.
     *
     * @param position Position of the item whose data we want within the adapter's
     *                 data set.
     * @return The data at the specified position.
     */
    @Override
    public Object getItem(int position) {
        return getModel(position);
    }

    /**
     * Get the row id associated with the specified position in the list.
     *
     * @param position The position of the item within the adapter's data set whose row id we want.
     * @return The id of the item at the specified position.
     */
    @Override
    public long getItemId(int position) {
        SingerModel model = getModel(position);
        if (Objects.isNull(model)) {
            return 0;
        } else {
            assert model != null;
            return model.getId();
        }
    }

    /**
     * Get a View that displays the data at the specified position in the data set. You can either
     * create a View manually or inflate it from an XML layout file. When the View is inflated, the
     * parent View (GridView, ListView...) will apply default layout parameters unless you use
     * {@link LayoutInflater#inflate(int, ViewGroup, boolean)}
     * to specify a root view and to prevent attachment to the root.
     *
     * @param position    The position of the item within the adapter's data set of the item whose view
     *                    we want.
     * @param convertView The old view to reuse, if possible. Note: You should check that this view
     *                    is non-null and of an appropriate type before using. If it is not possible to convert
     *                    this view to display the correct data, this method can create a new view.
     *                    Heterogeneous lists can specify their number of view types, so that this View is
     *                    always of the right type (see {@link #getViewTypeCount()} and
     *                    {@link #getItemViewType(int)}).
     * @param parent      The parent that this view will eventually be attached to
     * @return A View corresponding to the data at the specified position.
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (Objects.isNull(convertView)) {
            convertView = LayoutInflater.from(context).inflate(R.layout.activity_singer_list_item, null);

            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.bind(getModel(position));
        return convertView;
    }

    private SingerModel getModel(int index) {
        try {
            return list.get(index);
        } catch (Exception e) {
            return null;
        }
    }

    public static class ViewHolder {
        private final TextView tv_singer_name;
        private final TextView tv_singer_fans_count;

        public ViewHolder(View view) {
            tv_singer_name = view.findViewById(R.id.tv_singer_name);
            tv_singer_fans_count = view.findViewById(R.id.tv_singer_fans_count);
        }

        public void bind(SingerModel model) {
            if (Objects.isNull(model)) {
                return;
            }

            if (!Objects.isNull(tv_singer_name)) {
                tv_singer_name.setText(model.getSingerName());
            }

            if (!Objects.isNull(tv_singer_fans_count)) {
                String fansCount = model.getFansCount() + "";
                tv_singer_fans_count.setText(fansCount);
            }
        }
    }
}
